Henry County is in Western Illinois. Of the 102 counties in the state, Henry County is 16th in terms of its size (825 square miles). Henry County, Illinois, has roughly 1,000 acres of residential land for sale based on recent Land Network data. The combined market value of land for sale here was approximately $9 million. The average price of residential acreage for sale in Henry County was $604,821. Browse all residential land and rural property for sale in Illinois to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.